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Long-Term Debt - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]        
Long-term debt $ 809,663,000 $ 809,663,000   $ 456,900,000
Amortization of debt discount   3,774,000 $ 0  
Loans Payable        
Debt Instrument [Line Items]        
Long-term debt, gross 261,700,000 261,700,000    
Long-term debt 259,960,000 259,960,000   144,064,000
Loans Payable | Amended and Restated Senior Credit Agreement        
Debt Instrument [Line Items]        
Face amount 265,000,000.0 265,000,000.0    
Revolving line of credit        
Debt Instrument [Line Items]        
Long-term debt 262,000,000.0 262,000,000.0   312,000,000
Remaining borrowing capacity 320,500,000 320,500,000    
Revolving line of credit | Amended and Restated Senior Credit Agreement        
Debt Instrument [Line Items]        
Maximum borrowing capacity 585,000,000.0 585,000,000.0    
Letter of Credit        
Debt Instrument [Line Items]        
Letters of credit outstanding, amount 2,500,000 2,500,000    
Convertible Notes Payable | 2.625% Convertible Notes Due 2024        
Debt Instrument [Line Items]        
Face amount $ 345,000,000.0 $ 345,000,000.0    
Interest rate, stated percentage 2.625% 2.625%    
Interest rate, effective percentage 6.14% 6.14%    
Debt Instrument, Convertible, Gross Amount of Equity Component $ (51,600,000) $ (51,600,000)    
Amortization of debt discount 2,300,000 3,800,000    
Interest expense, debt $ 2,300,000 $ 3,800,000    
Initial conversion rate   11.2608    
Conversion price (in dollars per share) $ 88.80 $ 88.80    
Option indexed to issuer's equity, strike price (in dollars per share)   $ 114.92    
Equity component of convertible debt $ 39,100,000 $ 39,100,000    
Long-term Debt | Amended and Restated Senior Credit Agreement        
Debt Instrument [Line Items]        
Interest rate, effective percentage 4.25% 4.25%    
Mortgage notes        
Debt Instrument [Line Items]        
Long-term debt $ 0 $ 0   $ 836,000
London Interbank Offered Rate (LIBOR) | Long-term Debt | Amended and Restated Senior Credit Agreement        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.875%    
Federal Funds Effective Swap Rate | Long-term Debt | Amended and Restated Senior Credit Agreement        
Debt Instrument [Line Items]        
Basis spread on variable rate   0.50%    
Eurodollar | Long-term Debt | Amended and Restated Senior Credit Agreement        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.00%    
Call Option        
Debt Instrument [Line Items]        
Hedge and warrant transactions, net cash paid   $ 21,000,000.0